You can probably get away with 2 lifts if you wanted to. Just do 2 pushing, 2 pulling and 2 legs ones per week or mix it up how you want like 3 legs, 2 pushing, 1 pulling and then next week 3 legs, 2 pulling, 1 pushing. Really depends on how short the metcon is.. and what lifts you're doing.

But yeah go ahead and do it by the book if you're just gonna stick with it. Might want to sub one of the DLs for squats. Just try it and see how it feels though. If you haven't trained enough to the point where you've done different programs or know how you respond to different rep schemes exposing yourself now is always a good idea.